This could be useful also for plants found outside their native area
http://rjb.revistas.csic.es/index.php/rjb/article/view/459/487
http://rjb.revistas.csic.es/index.php/rjb/article/view/459/488
For the north American users it could be interesting to ascertain if the plants that there have been reported as O. umbellatum are the real O. umbellatum or, if at least som,e actually are something else like O. divergens
Interesting! I typically report the ones in my area as O. umbellatum, but to be quite honest I’d never looked deeply into it.
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